LAB 59: THE case STATEMENT

The ps command is different on BSD (Berkeley UNIX), System 5 (AT&T UNIX), and Linux. On System 5, the command to list all processes is
```
ps –ef
```
On BSD UNIX, the command is
```
ps aux
```
On Linux, the command is
```
ps -aux
```
Write a program called systype that will check for a number of different system types. The cases to test for will be
AIX
Darwin (Mac OS X)
Free BSD
HP-UX
IRIX
Linux
OS
OSF1
SCO
SunOS (Solaris/SunOS)
ULTRIX
Solaris, HP-UX, SCO, and IRIX are AT&T-type systems. The rest are BSD-ish.
The version of UNIX you are using will be printed to stdout. The system name can be found with the uname –s command or from the /etc/motd file.

Write a script called timegreet that will do the following:

Provide a comment section at the top of the script, with your name, the date, and the purpose of the program.
Convert the following program to use the case command rather than if/elif.


#!/bin/bash

# Comment section

you=$LOGNAME

hour=$( date +%H )

echo "The time is: $( date +%T )"

if (( hour > 0 && hour < 12 ))

then

   echo "Good morning, $you!"

elif (( hour == 12 ))

then

   echo "Lunch time!"

elif (( hour > 12 && hour < 16 ))

then

   echo "Good afternoon, $you!"

else

   echo "Good night, $you. Sweet dreams."

fi